Hi Everyone!
If you can to help me, I'll be very grateful.
I have a SQL Server 2005 cluster of two nodes and I'm tryng monitoring with SQL Monitor 3, however, the cluster IP not allow monitoring the SQL instance, only the server hardware, but the SQL instance reject the connection.
The same operation are OK in a different SQL instance, but without the cluster scheme.

SQL Monitor should work fine with clusters. To troubleshoot further, can you send in a screenshot of your "monitored servers" page and your connection log for the SQL instance? You can find the log by hovering over the instance and clicking "show log", then selecting "all events" on the next page. We have ticket #10310 open for you at support@red-gate.com.